Submitted by Mariana Dornelles Vargas (marianadv) on 2015-04-09T19:29:04Z No. of bitstreams: 1 brave_new.pdf: 1692012 bytes, checksum: e97e2e9fa84b8cbebf98f03fd05ed107 (MD5) / Made available in DSpace on 2015-04-09T19:29:04Z (GMT). No. of bitstreams: 1 brave_new.pdf: 1692012 bytes, checksum: e97e2e9fa84b8cbebf98f03fd05ed107 (MD5) Previous issue date: 2011-05-23 / Nenhuma / A presente pesquisa busca compreender as transformações e adaptações realizadas pelos participantes da Heroes Brasil com intuito de manter, organizar, aumentar o número de usuários e comunicar sobre a comunidade que é um fórum de discussão sobre o seriado televisivo Heroes no Orkut. A pesquisa utiliza-se da Netnografia como metodologia para observar o objeto empírico que tem como um de seus principais atrativos a distribuição dos episódios da série por meio da Internet. Os eixos teóricos estão divididos em Redes Sociais, Convergência de Mídias, Consumo e Identidades. Eles são analisados sob uma perspectiva em que todos interagem entre si. Não havendo importância maior para um eixo específico, nem mesmo sobre os diferentes atores que participam do fenômeno comunicacional, bem como suas adaptações e contradições. / This research seeks to understand the changes and adjustments made by participants of Heroes Brasil in order to maintain, organize, increase the number of users and communicate about community, a discussion forum about the television series Heroes on Orkut. The study utilizes the netnography methodology to observe the empirical object that has as one of its main attractions, the distribution of episodes of the series through the Internet. Theoretical contributions are divided into Social Networking, Convergence Media, Consumption and Identity. The themes are analyzed from a perspective in which all axes interact and the different actors involved in the communicational phenomenon have the same relevance, as well their adaptations and contradictions.

Inverse Synthetic Aperture Radar coherently processes the return signal from the target in order to construct the image of the target. The conventional methodology used for obtaining the image is the Fourier transform which is not capable of suppressing the Doppler change in the return signal. As a result, Range-Doppler image is degraded. A proper time-frequency transform suppresses the degradation due to time varying Doppler shift. In this thesis, high resolution joint-time frequency transformations that can be used in place of the conventional method are evaluated. Wigner-Ville Distribution, Adaptive Gabor Representation with Coarse-to-Fine search algorithm, and Time-Frequency Distribution Series are examined for the target imaging system. The techniques applied to sample signals compared with each other. The computational and memorial complexity of the methods are evaluated and compared to each other and possible improvements are discussed. The application of these techniques in the target imaging system is also performed and resulting images compared to each other.